>>> If the 1000 N force is on an object weighing 1000 kg, and the 1 N 
>>> force is on an object weighting 1 kg, then yes, they both require the 
>>> same amount of friction and will result in the same acceleration.
>>
>> This must truly be the definition of "counter-intuitive". I cannot 
>> begin to imagine how this can be true. It is surely self-evident that 
>> applying a large force requires better grip than does applying a small 
>> force.
> 
> Not if the contact force is proportionally higher.

I had assumed that the "amount of friction" already takes into account 
the contact force, along with the surface roughness, deformability and 
all the other things that affect friction.

Post a reply to this message